UNIT 1 ASSESSMENT



UNIT 1 ASSESSMENT

Circle the letter of the best answer.

1. When an unbalanced force acts on an object, the force

a. changes the motion of the object

b. is cancelled by another force

c. does not change the motion of the object

d. is equal to the weight of the object

2. The combination of all forces acting on an object is called the

a. balanced force

b. unbalanced force

c. net force

d. reaction force

3. The mass of an object is

a. the same as the weight of an object

b. the force of gravity acting on an object

c. the amount of space an object takes up

d. the amount of matter in an object

4. A force is described by both

a. speed and direction

b. velocity and speed

c. strength and direction

d. mass and weight

5. A cable being pulled from both ends is an example of

a. compression force

b. tension force

c. force of friction

d. force of gravity

6. The most fundamental rule relating to bridge design is that

a. the compression force must be zero

b. the tension force must be zero

c. the net force must be zero

d. the force of gravity must be zero

7. Two forces of equal strength that act on an object in opposite directions are

a. balanced forces

b. unbalanced forces

c. tension forces

d. compression forces

8. A problem with beam bridges is

a. the closer together its supports, the weaker a beam bridge gets

b. the farther apart its supports, the weaker a beam bridge gets

c. they can only be used to cross very short distances

d. they cannot balance the forces that act on them

9. Engineers design suspension bridges in order to

a. make the towers bear the entire weight of the load

b. lessen the cost of the bridge

c. decrease the tension forces

d. cross longer spans

10. A basic triangle in a truss is strong because

a. it can collapse into a parallelogram under a heavy load

b. it forms right angles

c. its shape cannot be distorted

d. its shape can be changed to make different designs

Answer the following questions in the space below. You may draw diagrams to help your answers.

11. Describe how to combine unequal forces acting in opposite directions.

12. Describe how balanced and unbalanced forces are related to an object’s motion.

13. How do you find the net force when two forces act in opposite directions?

14. Use the Venn diagram below to compare and contrast the characteristics of balanced and unbalanced forces.

[pic]

[pic]

15. Draw a simple beam bridge and label its parts. Draw arrows and label the tension/compression forces.

16. Draw a simple truss bridge and label its parts. Draw arrows and label the tension/compression forces.

17. Draw a simple suspension bridge and label its parts. Draw arrows and label the tension/compression forces.

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